Dread finding miscalculation on end of contract (6)
I believe the answer is:
terror
'dread' is the definition.
(synonyms)
'miscalculation on end of contract' is the wordplay.
'miscalculation' becomes 'error' (I've seen this before).
'on' means one lot of letters go next to another.
'end of' indicates one should take the final letters.
The last letter of 'contract' is 't'.
'error' after 't' is 'TERROR'.
'finding' acts as a link.
(Other definitions for terror that I've seen before include "Ovewhelming fear" , "Troublesome child" , "Extreme fear of dread" , "State of great fright" , "consternation" .)